A 2007 Sierra Club federal lawsuit against the state also compelled Wisconsin to reduce emissions or convert the UW-Madison?s Charter Street Power Plant and the state?s century-old Capitol Heat and Power Plant to cleaner options, such as natural gas. Former Democratic Gov. Jim Doyle?s administration promised to study ways to lower emissions at the state?s 15 coal-burning plants at UW campuses, prisons and other state buildings, resulting in the retrofitting or shuttering of some of the facilities.